params.py 文件源码

def get_args_index(target) -> int:
    """
    Returns the index of the "*args" parameter if such a parameter exists in
    the function arguments or -1 otherwise.

    :param target:
        The target function for which the args index should be determined
    :return:
        The arguments index if it exists or -1 if not
    """

    code = target.__code__

    if not bool(code.co_flags & inspect.CO_VARARGS):
        return -1

    return code.co_argcount + code.co_kwonlyargcount